<!DOCTYPE html>
<html lang="en">
<head>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>Document</title>
</head>
<body>
      <button click="btnEvt">fsad</button>

      <script>
            function btnEvt(){
                  console.log('123')
            }
      </script>
</body>
</html>